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Best Answer: Natural selection can increase the frequencies of alleles if they are advantageous to a species' survival and reproductive abilities.If they somehow produce a phenotype that is not a selective advantage, their frequency will decrease.lleles that give an organism a better chance of survival in their environment, better chance of reproduction, will become more frequent in a population. EX. There are dark and light moths in an environment.
change gene frequencies in populations (especially in small populations). Major concern is reducing habitat availability to the point where genetic drift will reduce genetic diversity within natural populations. Natural Selection which changes genotypic and phenotypic frequencies in populations, can result in adaptation to the environment.